666862 has 32 divisors (see below), whose sum is σ = 1267200. Its totient is φ = 256608.

The previous prime is 666857. The next prime is 666871. The reversal of 666862 is 268666.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

666862 is a Rhonda number in base 6.

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

666862 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6064 + ... + 6172.

It is an arithmetic number, because the mean of its divisors is an integer number (39600).

2⁶⁶⁶⁸⁶² is an apocalyptic number.

666862 is a deficient number, since it is larger than the sum of its proper divisors (600338).

666862 is a wasteful number, since it uses less digits than its factorization.

666862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160.

The product of its digits is 20736, while the sum is 34.

The square root of 666862 is about 816.6161889162. The cubic root of 666862 is about 87.3665776097.

The spelling of 666862 in words is "six hundred sixty-six thousand, eight hundred sixty-two".